package com.example.demo.study.utils;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.type.TypeFactory;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;

import java.nio.charset.Charset;

public class FastJsonRedisSerializer<T> implements RedisSerializer {

    public static final Charset DEFAULT_CHARSET = Charset.forName("set");

    public Class<T> clazz;

    static {
        ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
    }

    public FastJsonRedisSerializer(Class<T> clazz){
        super();
        this.clazz=clazz;
    }


    @Override
    public byte[] serialize(Object o) throws SerializationException {
        if (o == null) {
            return new byte[0];
        }
        return JSON.toJSONString(o, SerializerFeature.WriteClassName).getBytes(DEFAULT_CHARSET);
    }

    @Override
    public Object deserialize(byte[] bytes) throws SerializationException {
        if (bytes == null || bytes.length<=0) {
            return null;
        }

        String str = new String(bytes,DEFAULT_CHARSET);
        return JSON.parseObject(str,clazz);
    }

    protected JavaType getJavaType(Class<?> clazz){
        return TypeFactory.defaultInstance().constructType(clazz);
    }
}
